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Binary offset carrier modulation method based on time domain raised cosine pulses

A time-domain raised cosine and carrier offset technology, which is applied in the field of satellite navigation system signals, can solve problems such as code tracking performance, unsatisfactory anti-multipath and anti-jamming capabilities, and reduced power amplifier efficiency.

Inactive Publication Date: 2015-06-17
HARBIN ENG UNIV
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Problems solved by technology

The BOC modulation method given in the article will bring out-of-band large-amplitude sidelobes to reduce the efficiency of the power amplifier, and the code tracking performance, anti-multipath and anti-jamming capabilities of the signal are still not ideal, so the present invention proposes a method based on time-domain upscaling Cosine pulse binary offset carrier modulation method, which can effectively reduce the side lobe of the power spectrum, reduce the interference to adjacent signals, improve the power efficiency of navigation signals, and at the same time have better code tracking performance, Anti-multipath and anti-jamming capabilities provide a new option for the signal waveform design of my country's future Compass satellite navigation system

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  • Binary offset carrier modulation method based on time domain raised cosine pulses
  • Binary offset carrier modulation method based on time domain raised cosine pulses
  • Binary offset carrier modulation method based on time domain raised cosine pulses

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Embodiment Construction

[0046] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0047] (1) First determine the frequency f of the spreading code c or period T c , subcarrier frequency f sc or period T sc And the sine or cosine type subcarrier modulation method, wherein each subcarrier binary chip waveform adopts the time-domain raised cosine pulse form, specifically expressed as:

[0048] Described sinusoidal sub-carrier signal is: X S - sub ( t ) = sign ( sin ( 2 π f sc t ) ) × Σ i = 1 + ...

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Abstract

The invention belongs to the technical field of satellite navigation system signals, and particularly relates to a binary offset carrier modulation method based on time domain raised cosine pulses. The method includes the following steps that the frequency or cycle of a spreading code and the sub carrier frequency or cycle and sine or cosine subcarrier modulation mode are determined; spectrum spreading is conducted on a navigation signal through a pseudorandom sequence, time domain multiplying is conducted on an obtained spectrum spreading signal and the determined sine or cosine subcarrier signal, and a sine or cosine base band modulating signal is obtained; carrier modulating of an quadrature branch is conducted on the obtained sine or cosine base band module signal, and a binary sine or cosine offset carrier modulating signal based on the time domain raised cosine pulses is obtained. By means of the binary offset carrier modulation method, the power spectrum sidelobe decay rate of the modulation signal is higher, the amplitude is lower, and the energy concentration degree is higher.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation system signals, and in particular relates to a binary offset carrier modulation method based on a time-domain raised cosine pulse. Background technique [0002] The navigation modulation signal waveform is a key link in the design of the navigation signal system. The signal waveform affects the performance of the navigation system by affecting the autocorrelation function and power spectrum of the navigation signal. In order to enable multiple signals to better share the limited frequency band of the Global Navigation Satellite System (GNSS), and to further improve the ranging accuracy and anti-interference performance of the signal, new signal modulation methods are constantly emerging. Binary Offset Carrier (Binary Offset Carrier, BOC) is a new type of modulation that can meet the above requirements. For its implementation method, see the document Betz.J, "The Offset Carrier Modulat...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/01
CPCG01S19/01
Inventor 薛睿孙岩博赵旦峰曹庆铭
Owner HARBIN ENG UNIV
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